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What do the sunscreen numbers mean? These are the sun creams that protect the skin the most!

This is so! I'm sure you've heard millions of times that the numbers on your sunscreen represent how long you can be in it without the UV rays damaging your skin, right? Well, it's a false myth! It's time for us to uncover the big lies about something as delicate and important as our skin, so... Watch out!

The sun protection factor (SPF) that our sun protection has can save us on many occasions from burns caused by ultraviolet rays , but not because the SPF values ​​indicate the time in which we are safe from the sun...

Sun protection factors are those numbers that you usually see on sun cream containers and that are usually represented by the following numbers: 15, 30, 50, 50+ and 100.

In truth, that number that is represented in the sun cream indicates the number of times that the cream increases the natural resistance of our skin to solar radiation . This means that, with an SPF 50 , for example, the skin will take 50 times longer to burn than without its protection.

Therefore, the higher the SPF number, the more UVA/UVB rays will be filtered by the protection that we have used. In this way, while an SPF 15 will filter 93% of the UVA/UVB rays , the SPF 50+ will even do so with 99% of them. In the same way, although SPF 15 can protect the skin against sunburn , it will not be able to do so against skin cancer or premature aging , for example, since the amount of solar radiation absorbed will be much less .

However, even knowing that it is best to use an SPF 50+ or ​​SPF 100 , it should be noted that no sunscreen provides total protection against the sun's UV rays . Therefore, it is important to buy sun cream depending on the sensitivity of our skin to these rays (taking into account the skin phototype ).

Finally, keep in mind that you should apply the cream 30 minutes before sun exposure to give it time for it to fully absorb into the skin, otherwise it will not be effective.


If you want to know more about UV rays and the skin's sensitivity to them, keep reading!

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